Dynamo-electric machine.



J. G. MAGFARLANE & H. BURGB. DYNAMO ELECTRIC MACHINE. APPLICATION FILEDFEB.17',1911( Patented De0.17,1912.

UNITED STATES PATENT OFFICE.

JAMES Ci MACFARLANE AND HARRY BURGE, OF CHELMSFORD, ENGLAND, ASSIGNORSTO THE FIRM OFCROMPTON & COMPANY LIMITED, 01'! CHELMSFOB-D, ENGLAND.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented Dec. 1'7, 1912.

Application filed February 17, 1911. Serial No. 609,129.

MACFARLANE and HARRY BURGE, subjects of the King of Great Britain,residing at Arc Works, Chelmsford, in the county of Essex, England, haveinvented certain new and useful Improvements Relating to Dyna-mo-Electric Machines, of which the following is a specification.

This invention has reference to improvements relating to multipolardynamo-electric machines and it has for object an improved constructionof dynamo or motor of lighter and more accessible design than hitherto.

Bi-polar dynamo electric machines are known in which the yoke isarranged longitudinally of the armature spindle and forms part of themagnetic circuit of the machine, besides forming supports for thearmature bearings, but the distribution of the flux in a multi-polarmachine constructed in this manner is entirely different to that in abipolar machine, and moreover in a multipolar machine the polepieces arecapable of being arranged so as to be withdrawn from the machine withoutdisturbing the armature whereas in a bi-polar machine they cannot be sowithdawn.

In the herein described multi-polar machine the magnetic circuit from anorth to a south pole, both of which are above the armature or both ofwhich are below the armature, takes place as is usual in a planeperpendicular to the armature axis whereas the magnetic circuit from anorth pole situated above the armature to a south pole situated belowthe armature or vice versa takes place in planes parallel to thearmature axis and vertical planes perpendicular thereto. A portion ofthe return flux therefore is carried by a magnetic circuit partlyparallel to the armature spindle and partly perpendicular thereto andthe iron of which such circuit is composed can therefore be used as asupport for the armature bearings.

The appearance of the machine is that of a box having a top, a bottomand two ends, the sides of which have been removed, the poles beingremovably attached to the top and bottom and the armature being mountedin bearings carried by the ends.

If the pole pieces are mounted in a' ring shaped yoke, the plane of suchring instead of being arranged-perpendicular to the armature axis isarranged in the plane of the armature axis and supports the armaturebearings.

One constructional form of the invention 1s illustrated in perspectivein the accompanying drawings, the armature shaft being omitted forv thesake of clearness.

The field magnets A, A, and B, B, and armature (not shown) are embracedby a frame consisting of a substantially U-shaped pedestal portion Chaving superimposed thereon and magnetically connected thereto aninverted substantially U-shaped upper portion D, the armature spindlebeing mount ed in bearings carried at E, E, by the sides of said framewhich lies in the longitudinal vertical plane of the armature. One pairof pole pieces B, B, is carried upon the pedestal portion C and theother pair A, A, is carried upon the upper inverted U-shaped portion Dof the frame, each pole piece being mounted within the frame so as to becapable of removal therefrom laterally of the machine withoutdismantling any other portion of the machine. The lower pair of polepieces B, B, may be attached to the pedestal portion G, by means ofbolts, not shown, and the upper pair of pole pieces A, A, may beremovably secured to the upper portion D of the frame by means of boltsF; the yoke being raised or tilted until the bolts holding the polepieces B, B, become accessible and can be unscrewed, after which saidpole pieces are withdrawn laterally. Normally, the sides of the machineare completely open, but if desired protecting side covers may bedet-achably mounted upon the frame at each side. pole pieces and fieldcoils may easily be withdrawn from the machine for rewinding of thecoils or for repairs without removing the 'ari'nature, and when this isdone the armature may be re-woundl'in aim without further dismantlingthe machine, and the brush gear and commutator are all readily 100accessible through the open sides of the fran'ie. Further since theframe forms part of the magnetic circuit of the machine, and also formsa support for the armature bearings, the weight efficiency of themachine is 105 increased. Moreover the construction con duces to betterventilation of the armature.

What we claim is In a multi-polar dynamoelectric machine,

a. two-part yoke consisting of a pair of mu- 110 By means of such'aconstruction the tua'fiy opposed verhically arrangfi U-shaped membersconnected together detachably and magnetically, a pair of pole piecesmounted within each of said U-shaped members, the connection betweensaid members being out of the line of magnetic flux 0f the pole pieces,each of said pole pieces being withdrawable laterally cutward of thestructure without interference with any other part means to connectsaici U-shaped members, and means accessible exizernally of thestructure to c0nnect each of said pole pieces with said U- shapedmembers.

In testimony whereof we have hereunto JAMES C. MACFARLANE. HARRY 3URGrE.

Witnesses:

F. W. MARTIN, C. S. CAss.

